Feed apparatus for rotating boilers.



APPLICATION FILED OCT-18.1915.

Patented Oct. 9, 1917.

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FEED APPARATUS FOR ROTATING BOILERS.

Specification of Letters Patent.

Patented oet. a, in a.

Application filed October 18, 1 15. Serial No. 56,605.

To all whom it may concern:

Be it known that I, JoHAN VIK'roR BnoM- UI's'r, civil engineer, a subject of the King of Sweden, and residing at Frejgatan 38, Stockholm, Sweden, have invented certain new and useful Improvements in Feed Apparatus for Rotating Boilers, of which the following is a specification.

This invention relates to feed apparatus for rotating boilers. I

Inorder to keep the layer of water 1n rotating boilers approximately at a constant thickness independent of the steam consumption the influence of the centrlfugal force may be made use of with advantage. This invention relates to an improvement in feed apparatus by means of which this is carried into efiect.

The invention is illustrated by examples in the accompanying drawing, in which Figure 1 shows one form of the feed apparatus with a rotating boiler in vertlcal section.

Figs. 2 and 3 show two other forms of the same invention.

In the apparatus shown in Fig. l the water is fed into the rotating boiler 6 through the hollow journal 1 and then through the pipe 2. If'the boiler is empty and the feed water is admitted, after the fixed rotational velocity having been reached, the pressure in the water in the journal will be so much lower than the pressure in the rotating boiler as the centrifugal force of the water in the pipe 2.

By letting the water pressure in the journal and the steam pressure in the boiler act upon either side ofa diaphragm 3 connected with the balanced valve 4 in the feed pipe 9 this valve may automatically regulate the feeding. The steam pipe 10 is connected with the chamber on one side of the diaphragm 3 by means of a pipe 11. The thickness of the layer of water can be regulated by means of the tension spring 5. The valve t is full open when the boiler is empty. The thicker the layer of water, the smaller the difi'erence in pressure between the two sides of the diaphragm, until this difierence in pressure gets=0, when the valve is closed and the feeding ceases. By continued evaporation the thickness of the layer of water is diminished and the feed ing commences again. As a general thing, however, the valve will hold a middle position so that the feeding will be continual.

Instead of one pipe 2 two or more pipes diametrically arranged may be used so that the valve gets a more regular motion.

Fig. 2 shows another form of the apparatus. Here the journal is fully bored through and a disk 7' is firmly connected with the boiler end. The disk may also be p'rovided with blades arranged between the disk and the boiler end so that the same. effect may be obtained as in a centrifugal pump.

Instead of admitting the feed water in such a Way that it takes part in the rotatlon it may be fed through an immovable pipe 8, as shown in Fig. 3. In this case the pressure in the feed pipe is so much higher than the steam pressure as the centrifugal force of the water column in the boiler which consists of the thickness of the layer of water minus the distance between the orifice of the feed pipe and the inner cirdiaphragm 3 lifts the diaphragm 3 and thereby fully opens' the valve l, whereby feed water can enter through the pipe line.

If it were not for .the centrifugal force of the water in the pipe 2, then the pressure of the feed water in the pipe line would have to be at least equal to the pressure of the steam in the boiler, and a little bit over toallow for the friction of the water, etc.

The centrifugal force of the water in the pipe 2, however, tends to force it into the boiler, and so lessens the pressure necessary to force the water through the pipe line, by an amount equal to the centrifugal force of the water in the pipe 2.

The water can be forced through the pipe line, when its pressure is greater than the pressure of the steam in the boiler, minus the unbalanced centrifugal force of the water in the pipe 2.

Of course, as soon as the feed pipe line becomes full of water, the top of the diaphragm 3 undergoes the pressure of the water, but since, as before explained, the pressure of the feed water in the pipe line is less than the steam pressure on the underside pf the diaphragm 3, the valve 4 still remains open.

However, as a layer of water accumulates the pressure in the feed pipe line thereby' becomes greater due to slower rate of flow and the pressure at the top of the diaphragm 3 becomes greater.

This pressure of the water in the feed pipe line becomes greater until finally the spring 5 pulls down the diaphragm 3, and

. closes the valve a,- when the force of the spring plus the pressure of the water, exceeds the pressure of the steam.

As the water in the boiler is evaporated to make more steam, the thicknessof the layer decreases until the counter centrifugal force thereof decreases, so that the pressure required in the pipe line diminishes sufficiently to permit the steam to again raise the diaphragm 3 and allow the entrance of more water into the'teed pipe line. lln practice theoperation would be continuous,

. wearer What I claim is:--

L'An apparatus for regulating the feed valve, the action of said controlling means being dependent upon the thickness of the layer of the water in said revolving boiler.

2. An apparatus for regulating the feed water to a revolving boiler, comprising a feed pipe, a valve in said feed ipe, means controlled by given difference in pressure between the'water in said feed pipe and the steam in said boiler for operating said valve, and means for imparting to the water in the feed pipe the centrifugal force of the water in the revolving boiler.

In testimony whereof I have ailixed my signature in presence of two witnesses.

I JOHAN VIKTOR BLGMQUIST.

Witnesses:

SALLY 1F Zion, lEmN WAHMAN. 

